| Year | 1933 |
| Date | 16-Nov |
| Volume | 69 |
| Issue | 1,697 |
| Page | 467 |
| Category | General |
| Part | |
| Title | Speedometers and Tachometers |
| Author | Alfred W.Marshall |
| Notes | Inexpensive Instruments for Use with Pedal-driven Cycles, Small Engines and other Machines. Using a lathe in research, testing "No Flex", method of testing, actual road testing, testing "Cyclospeedo", the different speedometers |